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B-3
User Guide for Cisco Network Registrar, 7.1
OL-16002-01
Part 6 : Appendices, Glossary, and Index Appendix B DHCP Options
Option Descriptions
IP Layer Parameters Per Host
Table B-2 lists the options that affect the operation of the IP layer on a per-host basis.
Root Path 17 1 octet minimum Path name that contains the client root disk. The path is
formatted as a character string consisting of characters from
the NVT ASCII character set.
Extensions
Path 18 1 octet minimum Uses a string to specify a file, retrievable through TFTP. The
file contains information that can be interpreted in the same
way as the 64-octet vendor-extension field within the
BOOTP response, with these exceptions: the length of the file
is unconstrained, and all references to instances of this option
in the file are ignored.
Table B-1 RFC 1497 Vendor Extension Options (continued)
Option Name No. Length Description
Table B-2 IP Layer Parameters Per Host Options
Option Name No. Length Description
IP Forwarding
Enable/Disable 19 1 octet Specifies whether the client should configure its IP layer
for packet forwarding. Values: 0=disable; 1=enable
Non-Local
Source Routing
Enable/Disable 20 1 octet Specifies whether the client should configure its IP layer to
allow forwarding of datagrams with non-local source
routes. Values: 0=disable; 1=enable
Policy Filter 21 8 octet minimum;
multiples of 8 Policy filters for non-local source routing. The filters
consist of a list of IP addresses and masks that specify
destination/mask pairs with which to filter incoming source
routes. Any source-routed datagram whose next-hop
address does not match one of the filters should be
discarded by the client.
Maximum
Datagram
Reassembly
Size 22 2 octets Maximum size datagram that the client should be prepared
to reassemble. Value: 576 minimum
Default IP
Time-to-Live 23 1 octet Default TTL that the client should use on outgoing
datagrams. Values: 1 to 255
Path MTU
Aging Timeout 24 4 octets Timeout (in seconds) to use when aging Path MTU values
(defined in RFC 1191).
Path MTU
Plateau Table 25 2 octets minimum;
multiples of 2 Table of MTU sizes to use when performing Path MTU
Discovery as defined in RFC 1191. The table is formatted
as a list of 16-bit unsigned integers, ordered from smallest
to largest. Value: 68 minimum